Wrench



June 24, 1930. F. SCHWEIGERT 1,766,458

WRENCH Filed May 6, 1929 INVENT OR Patented June 24, 1930 STATES FREDERICK SCHWEIGERT, OF NEW YORK, N. Y.

WRENCH Application filed May 6, 1929. Serial No. 360,703.

This invention relates to new and useful improvements in wrenches.

The invention has for an object the provision of a device of the class mentioned which is of simple durable construction, depend able in use and efficient in action, and which may be manufactured and sold at a reasonable cost.

The invention proposes the use of detach- 1 able biting pieces for the jaws of wrenches,

arranged to be quickly and firmly adjusted and held in place upon the jaws so as to be exchangeable on the jaws of various wrenches, which is of extreme advantage in that new attachments may he engaged on wrenches to take the place of worn and damaged ones.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawing forming a material part of this disclosure Figs. 1, 3- and 4: are side elevational views of wrenches of different designs constructed according to this invention.

Fig. 2 is a vertical sectional view taken on the line 2-2 of Fig. 1.

Fig. 5 is a vertical sectional view taken on the line 55 of Fig. 1.

Fig. 6 is a vertical sectional view taken on the line 6-6 of Fig. 1.

Fig. 7 is an enlarged view of a modified form of invention.

The reference numeral 10 indicates generally the stationary jaw of a wrench, said jaw being connected with a handle 11 and is formed with a central opening 12. A movable jaw 13 with an integral lead thread 1 1 slidably engages in the stationary jaw and passes thru the opening 12. A control nut 15 is rotatively mounted in the opening 12 and threadedly engaged upon the lead thread 1 1 for adjusting the position of the movable jaw. A biting piece 16 is attached upon the movable jaw by rivets 17 and by a dovetail connection 18. The stationary jaw 10 has upper and lower working faces,

and a V-shaped biting piece 18 is mounted upon the stationary jaw and held in fixed positions by rivets 19. This v'-shaped biting piece has tongue elements 20 engaging in grooves formed in the stationary jaw. The nut 15 may be rotated until the movable jaw is completely disengaged therefrom and then this movable aw may be inserted thru the nut from the opposite side so that the movable jaw now coacts with the lower operating face of the stationary aw.

In the modified form of the device illustrated in Fig. 3, a stationary jaw 10 has been illustrated provided with four working faces indicated by reference numerals 21. Each of theseworking faces are provided with biting pieces 22 held in fixed positions by rivets 23. This wrench is also provided with a movable jaw 13 and a control nut 15. The operation of this wrench is similar to the one previously described but differs in that the movable jaw may be turned for coacting with any of the four working faces of the stationary jaw. The lead thread 14- is provided with grooves 24 engageable by projections from'the stationary'jaw to hold the movable jaw against rotation while the control nut is being rotated. "The wrench shown in Fig. 1 is also provided with grooves 21 for the same purpose.

ihe wrench 1llustrated 111 Fig. 1- 1s similar in construction to that-shown in Fig. 1 but differs in that the handle 11 is disposed at an inclination to the stationary jaw. Another point of difference between this wrench and the one shown in Fig. 1 is that the biting piece 18 upon the stationary jaw is formed of two separate sections independently secured upon the working faces of the jaw. This permits the removel of one or the other of the said biting sections.

In the modified form of the device illust-rated in Fig. 7, a portion of a wrench has been shown provided with a stationary jaw 10 having a central opening 12 with a control nut 15 rotatively mounted tnerein and en aging upon the lead thread 14 of a movable jaw 13 The stationary jaw 10 is formed with cavities 26 in which plungers 27 slidably engage. Collars 28 are fixed upon these plungers and expansion springs 29 act between the collars and the stationary jaw for normally urging one end of the plunger against the control nut 15. In this condition of the device the other ends of the plungers indicated by reference numerals 3O engage in apertures 31 in the sections of the biting piece 18 for holding these pieces against displacement. The pieces 18 are connected by a tongue and groove structure preferably of dovetail form upon the stationary jaw and in engaged position of the plunger-s 27 the biting sections are held against displacement.

In operation of the device, the wrenches are used in customary manners. In the event that the biting pieces become worn or damaged they may be replaced with new ones. In the form of the invention disclosed in Figs. 1 to. 6 inclusive the rivets which hold the biting pieces in place may be removed and then the biting pieces replaced. In the form of the device illustrated in Fig. 7 the nut 15 may be rotated until the lead thread 14 is disengaged therefrom. Then the movable jaw may be removed from the stationary jaw and the control nut also removed for permitting the springs 29 to move the plungers 27 inwards. This causes the ends 30 of the plungers to disengage from the biting pieces which may then be slid off the stationary jaw.

\Vhile I have shown and described the pre ferred embodiment of my invention, it is to be understood that I do not limit myself to the precise construction herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent is:

1. A wrench, comprising a stationary jaw connected with a handle and formed with an aperture, a movable jaw moved by manipulation of a control nut rotatively mounted in the said aperture, biting pieces on the jaws, means for holding the biting pieces in place, and means for automatically moving the holding means to an inoperative position upon removal of the control nut.

2. A wrench, comprising a stationary jaw connected with a handle and formed with an aperture, a movable aw moved by manipulation of a control nut rotatively mounted in the said aperture, biting pieces on the jaws, means for holding the biting pieces in place, and means for automatically moving the holding means to an inoperative position upon removal of the control nut, said holding means including a plunge.

3. A rench, comprising a stationary jaw connected ith a handle and formed with an aperture, a movable aw moved by manip- FREDERICK SCHVVEIGERT. 

